package com.jeeplus.core.excel.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * @Author Steel.D
 * @Description easypoi导入导出通用工具类
 * @Date 2019-7-31 9:29
 * @Param
 * @return
 **/

public class EasyPoiUtil {

    /**
     * 功能描述：复杂导出Excel，包括文件名以及表名。创建表头
     *
     * @param list           导出的实体类
     * @param title          表头名称
     * @param sheetName      sheet表名
     * @param pojoClass      映射的实体类
     * @param isCreateHeader 是否创建表头
     * @param fileName
     * @param response
     * @return
     * @author Steel.D
     * @Date 2019-7-31 9:30
     */

    public static void exportExcel(List <?> list, String title, String sheetName, Class <?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) {

        ExportParams exportParams = new ExportParams ( title, sheetName );

        exportParams.setCreateHeadRows ( isCreateHeader );

        defaultExport ( list, pojoClass, fileName, response, exportParams );

    }


    /**
     * 功能描述：复杂导出Excel，包括文件名以及表名,不创建表头
     *
     * @param list      导出的实体类
     * @param title     表头名称
     * @param sheetName sheet表名
     * @param pojoClass 映射的实体类
     * @param fileName  文件名
     * @param response
     * @return
     * @author Steel.D
     * @Date 2019-7-31 9:35
     */

    public static void exportExcel(List <?> list, String title, String sheetName, Class <?> pojoClass, String fileName, HttpServletResponse response) {

        defaultExport ( list, pojoClass, fileName, response, new ExportParams ( title, sheetName ) );

    }


    /**
     * 功能描述：Map 集合导出
     *
     * @param list     实体集合
     * @param fileName 导出的文件名称
     * @param response
     * @return
     * @author Steel.D
     * @Date 2019-7-31 9:45
     */

    public static void exportExcel(List <Map <String, Object>> list, String fileName, HttpServletResponse response) {

        defaultExport ( list, fileName, response );

    }


    /**
     * 功能描述：默认导出方法
     *
     * @param list         导出的实体集合
     * @param fileName     导出的文件名
     * @param pojoClass    pojo实体
     * @param exportParams ExportParams封装实体
     * @param response
     * @return
     * @author Steel.D
     * @Date 2019-7-31 9:50
     */

    private static void defaultExport(List <?> list, Class <?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {

        Workbook workbook = ExcelExportUtil.exportExcel ( exportParams, pojoClass, list );

        if ( workbook != null ) {

            downLoadExcel ( fileName, response, workbook );

        }

    }

    /**
     * 功能描述：Excel导出
     *
     * @param fileName 文件名称
     * @param response
     * @param workbook Excel对象
     * @return
     * @author Steel.D
     * @Date 2019-7-31 10:35
     */

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {

        try {

            response.setCharacterEncoding ( "UTF-8" );

            response.setHeader ( "content-Type", "application/vnd.ms-excel" );

            response.setHeader ( "Content-Disposition", "attachment;filename=" + URLEncoder.encode ( fileName, "UTF-8" ) );

            workbook.write ( response.getOutputStream ( ) );

        } catch (IOException e) {

            throw new RuntimeException ( e );

        }

    }


    /**
     * 功能描述：默认导出方法
     *
     * @param list     导出的实体集合
     * @param fileName 导出的文件名
     * @param response
     * @return
     * @author SteeL.D
     * @Date 2019-7-31 10:45
     */

    private static void defaultExport(List <Map <String, Object>> list, String fileName, HttpServletResponse response) {

        Workbook workbook = ExcelExportUtil.exportExcel ( list, ExcelType.HSSF );

        if ( workbook != null ) ;

        downLoadExcel ( fileName, response, workbook );

    }


    /**
     * 功能描述：根据文件路径来导入Excel
     *
     * @param filePath   文件路径
     * @param titleRows  表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass  Excel实体类
     * @return
     * @author Steel.D
     * @Date 2019-7-31 11:05
     */

    public static <T> List <T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class <T> pojoClass) {

        //判断文件是否存在

        if ( StringUtils.isBlank ( filePath ) ) {

            return null;

        }

        ImportParams params = new ImportParams ( );

        params.setTitleRows ( titleRows );

        params.setHeadRows ( headerRows );

        List <T> list = null;

        try {

            list = ExcelImportUtil.importExcel ( new File ( filePath ), pojoClass, params );

        } catch (NoSuchElementException e) {

            throw new RuntimeException ( "模板不能为空" );

        } catch (Exception e) {

            e.printStackTrace ( );


        }

        return list;

    }


    /**
     * 功能描述：根据接收的Excel文件来导入Excel,并封装成实体类
     *
     * @param file       上传的文件
     * @param titleRows  表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass  Excel实体类
     * @return
     * @author Steel.D
     * @Date 2019-7-31 11:30
     */

    public static <T> List <T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class <T> pojoClass) {

        if ( file == null ) {

            return null;

        }

        ImportParams params = new ImportParams ( );

        params.setTitleRows ( titleRows );

        params.setHeadRows ( headerRows );

        List <T> list = null;

        try {

            list = ExcelImportUtil.importExcel ( file.getInputStream ( ), pojoClass, params );

        } catch (NoSuchElementException e) {

            throw new RuntimeException ( "excel文件不能为空" );

        } catch (Exception e) {
            e.printStackTrace ();
            throw new RuntimeException ( e.getMessage ( ) );

        }

        return list;

    }


}
